Thermic telephone.



B. GWOZDZ. THERMIC TELEPHONE.

APPucATm mio scPT. 14. 1911.

Patentea Apr. 18, 1915-.

sons BRoNiszeaw Gwn, or soHNEIoHE, NER BERLIN, GERMANY.

THERMIC TEL'EPI'IONE.

Specifieation of Letters Patent.

Application filed September 14, 1911 Serial No. 649,388.

T0 all 'whom it m'ay/ conoern Be it known that I, BRoNisAw Gwn, a subject of the Czar of Russia, and residing at Schneiche, near Berlin, Germany, have 'invented 'provements in 'l'hermic Telephon'es,

the following is a specification.

The subject-matter of my invention is an improved thermic telephone.

In the Letters Patent No, 998,965. isdisclosed a processof manufacturing hot-Wire devices for thermic telephones of platinum wires treated according to the W'Ollaston process, in which the shaped Wollaston wre is provided with a east, from one end of which projects only the portion of the wire to be snbjected to the known eorrosive process. The cas't is block-like in Shape, so that it can be used as a holder of the hot lwire in the telephone. This idea of using the cast as-a holder of the hot Wire adm'its of `'the hot 'wire being .made readily exchangeof which able which is very important; pa rticularly in thermic telephones.

`l\''o\v` a primary oliject of my invention is to provide a special construction of thcrmie telephone, comprisintgr a hot-wire device which can be carried within the auditory duet. The telephone is very simple so that, in spite of the smallncss of the` apiiaratus due to its purpose, the hot-wire device can be readily exchanged even by inexperienced persons. 'l'o these ends, the' hot-wire device is councctedin eircuit within the telephone by means of an elastic 'frictional eontact piw-c; so that it is 'only requisite to pull out and push in the block-like hot-Wire de- I vice iu order to break or make the electrical connection when exchanging the device. In addition, i cnlploy iii my new telephone for the exiceedingly Sensitive hot-wirean impmved lejuard vwhich positively protccts theI hot wire fromv contact with auditorysecrevtions while the' tolcphone is being used in the ear and simultaneously allow the telephone' to be'cleaned. iu a simple manner `without al'iydiiliculty to inexperienccd perand without anly fear of the telephone being `inirn'e-l`.. The said ,guard forms a double cover lfor, the telephone a`|"crture from whieh'the' sound issues, one cover being a tensioned porous very fine fabrie, (f. Silk muslin, and the second a small perforated plate of solid n'iaterial; the latter is arranged at a certain distance from the former and parallel thereto and can `;he removed certain new and useful Im-4 .tact pins; Fig.

alone and independently of the said fabric from the telephone casing for thM purpose of Cleaning it. One illustrativc embodimcnt of my inviention and seve 'al modifications thercof are represented by way of example on an enlarged Scale ,in the accoinpanying` drawing, wherein Figure -l is` a longitudinal section through one form of atheriuic telephone in which the ends of the lVollaslon wire are 'formed as contact pins; Fin: 2 is a'n elevation showingthe principal parts of the apparatus according to Fig. l when pulled apart; Fig. 3 shows in secticma] elevation and plan the principal parts of a modified form in which the Wollaston 'rircs in the block-like cast open out into sockets adapted to receive con- 1lis a hottom plan view of the telephone shown in'Fig. l; Fig. 5 is a longitudinal section through another modiied form in which the block-like cast isprovided with a metallic holder, and Figs. G and 7 show details of the telcphone shown in Fig. 5; Figs. 8, 9 and 10 are detail views of a modified form of contact members.

lefrrring lirstly to Figs. 1, 2 and 4, as is desrribed in the Letters Patent No. 998,965, the lVollaston wiro 1 is provided with a (-ast from oneend of which only the Wire loop 2-5 srrving as hot wire projects. The ruds 4 of the lVollaston wire project from the other side of the block or (fast 1 in such manner that they can bo used as contact pins and bc pushed into sockets 5 provided ina block-like body (5 composed of insulation. This insulator (i and also the (fast 2 are carried in a socket like casinfr 7 having a redured end S through which the Ilexible cord euicrs. 'l`his lcible cord 9 is prevented from being' pullrd out of the cud` 8 of the socket' or ('asingzA T by a thirkened portion or collar [O which is provided at the end of theA fh-xiblorord and ran bo made in any suitable n'amu'|'.:.{/.by windurj` a sllk or other thread. around the cord, or by pro'. iding on i the cord a special colla'l or rap as is represontcd in Fig. 5. 'l`he wires 'li of the flexibh' rord 9 have thcrrizo for the sake of'safcty. i

'l`hc insulator and also the cast 2 are held in position in a screw-tlnreaded cylinder 12 whose inner shoulder' 13 rests against the front face of the cast This cylinder l2'1'n'eferably has a conicak apertuie l-l:

Patleneea Apr. v13, 1915. i

their ends inserted into the i ,noi-kids 5 from the rear and may be soldered of foreign bodies into the whereas the emisslon of forming the sound Chamber in which is located the hot Wire. Mounted on the front face 15 of the cylinder 12 is the above-mentioned, very fine, porous fabric 16 consisting, for example, of silk muslin or other similar material, which .prevents the admission sound chamber and to the hot wire, the sound waves is not materially'impaired. Further, I arrange in front of the fabric 16 and parallel thereto a small perforated plate 17 which is preferably held in, position by a ring 18 screwed on the cylinder 17 or is connected therewith, and can readily be removed alon'e or together with the ring 18 from the cylinder 12. Owing to the provision of this perforated' plate the secretions' in the ear will settle thereon and eonsequently 'cannot pass into the interior of the sound Chamber. But as this'plate is composed of solid material, and consequently is not .vcry'sensitive or delicate and, in addition, is readily removable, after the same has been removed'valone or together with the' ring 18, it can be readily cleaned or washed, e. g. with alcohol, benzinor similar materials.

In order to exchange the hot-Wire device in the embodiment according'tov F ig. 1 the cylindrical part 12 is first unscrewed and then the hot-Wire device together with the insulator 6 carrying the sockets 5 are simply removed by pulling lthem out of the rear part of the casing 7 in the manner shown in Fig. 2. When this has been done the hotwire device can be readily separated from the insulator 6. -As described in my4 copending application Serial N 0.644,243, filed Aug. 15, 1911, the new hot-Wire device to be inserted 'ispreferably provided with an elastic guard 'or cap 19 having la bell--shaped bottom 20 which protects the hot Wire. The contact pins of the new hot-Wire device provided with the` cap 19 are then introduced into the sockets 5 of the insulator 6, 'Whereupon both the cast 2 and the insulator 6 are pushed. into the casing 7, this being readily possible. because the hot Wire of the cast 2 is protected by the cap 19. When the cast 2 is held in this manner in the casing7 the cap 19 is removed by taking hold of its projecting to be introduced into the auditory duet;

. the liner 28 and the' within the cast 2 are embedded small tubes 22 into which the ends of the short Wollas-- Fig. 5 shows another modified form. 'The' block-like cast is here provided ,with a metal mount or holder 26 as is represented, for example, in F igs. 3, 7, 9 of my co-pending ap- 'plication Serial No. 614,243 filed Aug. 15, 1911, and in Fig. 11l of the same co-pending application, with which is connected the one end ofthe VVollaston Wire.. The other end of the VVollaston Wire projects as an eye 01' loop 27 'out of the cast. The position of the wire bow 8 serving as' hot wireis the `same as described above and in the' LettersPatent mentioned above.l In order to bringfabout the necessary electrical connection by simply pushing in the cast provided With the metal holder 26, the socl'et or casing 7whose constricted part 8 likewise secures the. thickened end or collar 1'0 of the fleXible cable is' provided within with a metal liner 28` which is held in the casing .7 'by a screw 29, by

which the one wire 11 is also secured in po-l screw 29. The insulator 30 is hereby simultaneously prevented from rotating. At the opposite side the insulator 30 carriesza screw 32 by which, on the one hand, the other Wire 11 is held 'and which, on the other hand,`

holds a spring 33 which may either be bent U-shaped, ras shown in Figs. 5 and 6, or may be of any other shape, e. g. spiral.

i When thehot-wire device provided with the metal holder 26 and with a contact loop 27 is inserted into the casing 7 o r into the elastic metal liner, the Circuit is at once closed on thelone hand by the one wire 11, holcler 26, and onr the other hand by the other Wire 11,'spring 33 and contact loop 27,' so that the hot Wire is fed with current and is exposed to ,the fluctuations of current in the circuit. The cast or the hot-Wire device is secured in the telephone casing by means of a cylinder 12 as described above, and the fabric 16 and the small perforated plate 17 can also be employed, as shown in the drawing.` The hotwire device can-.in this form be ezchanged more readilyas compared'with the examples according' to' Figs. 1 to 4: ina-smuch as the hot-Wire device does not require to be inserted in one special position in order to connect .it with the contact pins, because twist the flexible cord 9 in the end 8 of the socket or casing 7, as owing to the fineness of the wires this might readily lead to rupture' of the wires 11, I prefer to provide the end of the flexible cordv with a metal collar or caplO having a lateral lug 34 projecting into a corresponding recess in the inner wall of the part 8, so thatl it is impossible for this cap and the fiexible lcord to turn inside the casing.

In all the above-described embodiments, of which that shown in Fig.l 5 is represented on a scale about twice the natu 'al size, it is to be observed that constructive ditliculties are prima-rily due to the extreme smallness of the 'entire appara-tus, and that the apparatus must be so formed that even an inexperienced person can readily exchange and clean itsparts without injuring the exceedingly Sensitive hot wire.

. As cmphasized above, the difliculty is to make such a thermic telephone so exceedingly small. For this reason there may be ditficulty in the embodiment according to Figs. 1 and 2 in .arranging the conductors ll, on the one hand, and the ends of the Wollaston Wire '4 formed as contact pins', on the other hand, in the insulator 6 inasmuch as owing to this insulator being very thin 'there is not much room for securing the wires 11 in the requisite mannei'. VAnother object of my invention is to obviate this defect. To this end, I arrange the contacts in the insulator 6, as represented in Figs. 8 and 9. lThe contacts are here two small tube's a and Z) united in pairs by a small disk or bar c, as represented on an enlarged scale in Fig. 10. The tubes a, Z) pass completely through the insulator G and they are preferably opposite one another, asy shown in Fig. 8. The tubes a then serve for example for receiving'the wires 11 of the' flcxible cord 9, while the ends 4 of the "ollaston Wire formed as contact pins are inserted into the tubes b. As the tubcs "a, 7) pass through the entire thickness of the insulator G as mentioned above, in this form there is a greater surface, so that greater Safety is' o tained both with regard to the arrangement of'the wires 11 and to the contact pins l to be held by friction.

It is obvious that the abovc-desm'ibcd contact member can be constructively modified inv various respects. For example, for

each 'pole a small metal plate may bc employed having two holes such that the wire 11 can be inserted into the one hole and the 'Vollaston wire formed as a contact pin of the present invention, because it is solely a `matter of providing'for each pole tw) holes passing entirely through the insula-` tor.

I claim:--4

'1. l'n a thermic telephone, the combination, with a casing, o t'contact'means for connection to an electric circuit therein, an axially displaceable hot-Wire devicefhaving contact members adapted to contact with the said contact means, and a body for holding the said hot-Wire device in the con-V tact position.

'2. In athermic telephone, the combination with a casing, of contact means for connection to an electric circuit therein, an axially displaceable hot-Wire device having contact members adapted to contact with and be held in the casing by friction with said contact means and a member having a sound-chamber, secured detachably to the casing and holding the hot-Wire' device therein.

8. In a thermic telephone,` the combination with a casing, of contact means for connection to an electric circuit therein, an axially displaceable hot-Wire device, the ends of the said wire being,` connected to contact members adapted to contact with and be held in the casing by friction with the said contact means and a member having a sound-chamber, secured detachably to the casingI and holding the hot-wire device therein. v T

4. In a thermic telephone, the combination -with acasing, of an axially displaceable hot-Wire device therein, an insulator betweenthe bottom of the casing and the hot-Wire device, the said insulator being provided ,with contact means for connection to an electric circuit therein, the said hot- 'wii'e device being provided with contact members adapted to contact with and be held in the casing by friction with said contact means and a member having a sound-- chamber, 'secured detachably to the casing and holding the hot-Wire device therein.

In a thermictelephone', the combination with a casing, of an axially displaceable hot-Wire device therein, an insulator between the bottom of the casing and the hot-Wire device., the said insulator being provided with contact soekets connected with the conductors of the outcr circuit, the said hot-Wire device having projcct'ing limbs adapted to engage the said soekets for connection to an electric circuit and a member havingr a sound-chamber, sccured detachably to the casing and holding,r the hotwire device therein.

6. In a thermic tclephone, 'the combina tion with a` casing having!` a male thread, of an insulator axially dis1'lae'able in the casing, two electrically conductinr,nr sockets carried by the insulator, a hot-Wire device comprising a cast and a "Wellaston Wire carried thereby axially' displaceable in the casing, the two limbs of the said Vollaston' Wire being normally held by-friction by the said sockets, and a cylindrical member screwed on the casing holding the said cast and the said insulator in the casing.

7. In a thermic telephone, the combination with a casing having a male thread, of an insulator axially displaceable in the casing, two electrically condncting sockets carried by the insulator, a. hot-Wire device comprising a cast and a I'Vollaston Wire carried therebyaxially displace'able in the casing, the two limbs of the said Vollaston Wire being normally held by friction by the saidj sockets, and a cylindrical member having a sound chamber screwed on the easing holdinglthe said cast and the said insulator in the casing.

8. In'athermic telephone, the combination with a casing having a male thread, of

an insulator axially displaceable in the casing, two electrically conducting sockets carried'by the insulator, a hot-Wire device comprising a cast and a VVollaston Wire carried thereby axially displaceable inthe casing, the two limbs of the said Vollaston Wire being, norma-lly held by friction by the said sockets, and a cylndrical member having a 9. In a thermic telephone, the c0mbina-' tion with a casing having a malethread, ofv

an insulator axially displaceable in the' casing, two electrically conducting soekets carried by the insulator, a hot-wlre device coinprising a cast and a l/Vollaston Wire carried thereby axially displaceable in the casing, the two limbs of the said 7011aston Wire being normally heldby friction by the said sockets, a fiexible cord passing through the bottom of the easing and connected to the said sockets, a collar on the end of the cord in the casing, and a cylindrical member Screwecl on the casing, holding 'the said ca-s and the said insulator in the casing.

In testimony, that I claimthe forcgoing as my 'invention, I have signed my name in presence of two subscribing witnesses.

BRONISAVV GWOZDZ. "'Vit'nesses foLDIzM/xn I'IA'UPT, HENRY I'IASPER.

O'opies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C." 

